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Geothermal energy is natural heat from the interior of the Earth that is converted to heat buildings and generate electricity. The idea of harnessing Earth’s internal heat is not new. As early as 1904 , geothermal power was used in Italy . Today, Earth’s natural internal heat is being used to generate electricity in 21 countries , including Russia, Japan, New Zealand, Iceland, Mexico, Ethiopia, Guatemala, EI Salvador, the Philippines, and the United States .Total worldwide production is approaching 9,000 MW (equivalent to nine large modern coal-burning or nuclear power plants)-double the amount in 1980 .Some 40 million people today receive their electricity from geothermal energy at a cost competitive with that of other energy sources. In EI Salvador , geothermal energy is supplying 30% of the total electric energy used. However, at the global level, geothermal energy supplies less than 0,15%of the total energy supply.

 

Geothermal energy may be considered a nonrenewable energy source when rates of extraction are greater than rates of natural replenishment. However, geothermal energy has its origin in the natural heat production within Earth , and only a small fraction of the vast total resource base is being utilized today. Although most geothermal energy production involves the tapping of high heat sources, people are also using the low-temperature geothermal energy of groundwater in some applications.

What is true about geothermal energy production worldwide?

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I was discouraged to swim when I put my feet in the ice-cold water

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GREENFORCE

 If you’re interested in having the trip of a lifetime, but also doing something useful at the same time, then why not try joining a Greenforce expedition as a volunteer. Greenforce, which was (31)________in 1997, is an international research agency that gathers information about the wildlife and natural habitats in various parts of the world. There is a qualified biologist in (32)________of each team of volunteers and these carry out surveys all year round in some of the world’s remotest and most beautiful places. Volunteers come from all walks of life. The minimum age is 18 years, but there is no upper age limit. No previous experience is necessary as Greenforce provides location training in animal identification and survey methods. You’ll need to be somebody who enjoys the outdoor life, however, as working in remote (33)________can be challenging. You’ll also need to be passionate about wildlife and prepared to learn a lot about the place you visit. Each expedition lasts for ten weeks, and training begins in the UK with a residential weekend where you can get a (34)________of expedition life and meet up with some of your team mates, as well as learning about first-aid and basic survival skills. Each volunteer (35) )________£2,550 towards the cost of the expedition, but past volunteers say it is worth every penny.

Điền vào ô số 35

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It is generally believed that high level of carbon emissions lead to climate change

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I was in disguise when I met them ; as the result, of course they didn’t recognise me

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Burglars tend to________away from buildings which are securely locked.

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When he came ________all that money, he thought he would lose his mind.

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We went into town ________some new clothes.

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You’d better go to bed early, ________?

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Contrary to expectations, South Korea________to the semi-finals of the 2002 Word Cup.

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________lectures at your university?

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I wonder if I ________some question for our survey.

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Don’t worry –it’s________natural to lose your temper sometimes.

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________by his parents at an early age, Paul took to stealing.

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Vitamins, taken in tiny doses, are a major group of organic compounds that regulate the mechanisms by which the body converts food into energy. They should not be confused with minerals, which are inorganic in their makeup. Although in general the naming of vitamins followed the alphabetical order of their identification, the nomenclature of individual substances may appear to be somewhat random and disorganized. Among the 13 vitamins known today, five are produced in the body. Because the body produces sufficient quantities of some but not all vitamins, they must be supplemented in the daily diet. Although each vitamin has its specific designation and cannot be replaced by another compound, a lack of one vitamin can interfere with the processing of another. When a lack of even one vitamin in a diet is continual, a vitamin deficiency may result.

The best way for an individual to ensure a necessary supply of vitamins is to maintain a balanced diet that includes a variety of foods and provides adequate quantities of all the compounds. Some people take vitamin supplements, predominantly in the form of tablets. The vitamins in such supplements are equivalent to those in food, but an adult who maintains a balanced diet does not need a daily supplement. The ingestion of supplements is recommended only to correct an existing deficiency due to unbalanced diet, to provide vitamins known to be lacking in a restricted diet, or to act as a therapeutic measure in medical treatment. Specifically, caution must be exercised with fat-soluble substances, such as vitamins A and D, because, taken in gigantic doses, they may present a serious health hazard over a period of time.

How many vitamins must be derived from nourishment?

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 Jeff, the security guard at the factory, ________this robbery ________on his shift last night.